Skip to main content
UploadLanguage (EN)Support
BusinessMobileSocial MediaMarketingTechnologyArt & PhotosCareerDesignEducationPresentations & Public SpeakingGovernment & NonprofitHealthcareInternetLawLeadership & ManagementAutomotiveEngineeringSoftwareRecruiting & HRRetailSalesServicesScienceSmall Business & EntrepreneurshipFoodEnvironmentEconomy & FinanceData & AnalyticsInvestor RelationsSportsSpiritualNews & PoliticsTravelSelf ImprovementReal EstateEntertainment & HumorHealth & MedicineDevices & HardwareLifestyle
Uploaded byAnkitaYadav171
PPTX, PDF4,736 views

types of meristems.

This document summarizes the different types of meristematic tissue in plants. Meristematic tissue consists of actively dividing cells that allow plants to grow and develop different cell types. There are three main types of meristematic tissue based on origin: promeristem, primary meristem, and secondary meristem. Additionally, meristematic tissue can be categorized based on position as apical, intercalary, or lateral meristems. Finally, meristematic tissue types can be distinguished based on their function in forming epidermal, vascular, or ground tissues systems or based on their plane of cell division as rib, plate, or mass meristems.

Education◦
Downloaded 16 times
Tissues that have the ability to enlarge, stretch and differentiate into other types of cells as they mature. The cells of this tissue are generally young and immature, with the power of continuous division. Meristematic cells are all living cells. The meristematic cells can be oval or rounded or polygonal in shape. They have a large nucleus with no vacuoles. Intercellular space between cells is absent. The cells are also small in size but have a high capacity of cell division.
ON THE BASIS OF ORIGIN: Meristems are 3 types: PROMERISTEM: Also know as embryonic meristem. Present at the apices of the shoot and root tip. It divides to form primary meristem. PRIMARY MERISTEM: Found below the pro-meristem in the shoot and root tip. They divide to produce primary permanent tissue that forms the primary plant body. SECONDARY MERISTEM: It is formed later in the plant body. It develops from primary permanent tissue due to dedifferentiation. They divide to produce secondary permanent tissue that forms the secondary plant body. They are interfascicular cambium & cork cambium.
on the basis of position.
ON THE BASIS OF POSITION: Meristems are 3 types: APICAL MERISTEM: These meristems are located on the tip of the root, stem etc. They help in the growth of the root system as well as the shoot system. The various cell divisions along with the cellular enlargement help in the growth of the stem above the ground and the growth of the root below the ground.
INTERCALARY MERISTEM:The intercalary meristems are located at the internodes or the base of the leaves. The intercalary meristems help in increasing the length of the internode. This is usually seen in monocotyledonous plants.
LATERAL MERISTEM: The lateral meristems are present on the lateral side of the stem and root of a plant. These meristems help in increasing the thickness of the plants. The vascular cambium and the cork cambium are good examples of a lateral meristematic tissue.. Intrafascicular cambium is present in primary plant body but divides to produce secondary permanent tissue.
ON THE BASIS OF FUNCTION: Meristems are 3 types: PROTODERM: Forms the Epidermal tissue system. PROCAMBIUM: Forms the Vascular tissue system. GROUND MERISTEM: Forms the Fundamental or Ground tissue system. ON THE BASIS OF PLANE OF DIVISION: Meristems are 3 types: RIB MERISTEM: Cells divide in one plane, forming a row of cells. E.g., formation of lateral roots. PLATE MERISTEM: Cells divide in two planes, forming a plate like structure. E.g., formation of lamina in leaves. MASS MERISTEM: Cells divide in all planes, forming a mass of cells. E.g., formation of cortex, pith, endosperm.